Carrier frequency estimation method for digitally modulated signal
Xiaoping Feng · Systems engineering and electronics · 2004
To estimate carrier frequency of digitally modulated signal whose modulation type is unknown, a carrier frequency estimation method for digitally modulated signal is proposed. The method estimates carrier frequency from the signal's instantaneous frequency, and improves the estimation precision by decreasing the wave and impulse of the signal's instantaneous frequency through detecting signal's better segments and median filtering. The basic principle of the method is discussed, the detailed calculation steps are given. The simulation results show that the precision is acceptable for all kinds of digitally modulated signals with the high SNRs(≥5 dB),and the method is also suited to practical engineering.